I am shooting the Cabelas Lazer Supreme which is the 'deluxe' version of the Lazer Pro Mags. They both use the same blades but a different retaining system: o-rings vs. a locking collar.

My only major complaint about them is that the replacement blades I ordered were less than razor sharp right out of the box. Pretty disappointing, especially if you compare them to the blades on a Thunderhead. I guess you get what you pay for.